Okla. Stat. tit. 21, § 2100.1

Any sex offender required to be registered pursuant to the Oklahoma Sex Offenders Registration Act who engages in ice cream truck vending, whether or not licensed in this state as a mobile food unit shall, upon conviction, be guilty of a Class D1 felony offense and shall be punished by imprisonment as provided for in subsections B through F of Section 20N of this title, or by a fine in an amount not exceeding One Thousand Dollars ($1,000.00), or by both such fine and imprisonment. A sheriff or police officer may arrest without a warrant any person who the officer has probable cause to believe has violated the provisions of this section.